package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;

    /**
     * 根据微信授权码实现微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        //得到openid
        String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否为空，为空则登录失败，抛出业务异常
;        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断是否为新用户，即该openid是否在表中
        //如果是新用户，自动完成注册
        User user = userMapper.getByOpenid(openid);
        if(user==null){
            //自动完成注册
            //即自己构造用户信息，插入到用户表中
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        //返回这个用户对象
        return user;
    }

    private String getOpenid(String code){
        //请求参数封装
        Map map = new HashMap();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");

        //调用工具类，向微信接口服务发送请求
        String json = HttpClientUtil.doGet(WX_LOGIN, map);
        log.info("微信登录返回结果：{}", json);

        //解析json字符串
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        log.info("微信用户的openid为：{}", openid);

        return openid;
    }

}
